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- W1995101383 abstract "A voltammetric procedure is described which allows determination of rate constants for reactions of hydroxyl radicals. Hydroxyl radicals, generated by reaction of an iron-EDTA complex with H2O2 in the presence of ascorbic acid, attack deoxyribose to form products that, upon heating with thiobarbituric acid under acid conditions, yield a pink chromogen with second order derivative cathodic wave at −0.88 V vs SCE. Added hydroxyl radical `scavengers' compete with deoxyribose for the hydroxyl radicals produced and diminish chromogen formation. The electrochemical behavior of the chromogen has been determined using voltammetry and cyclic voltammetric techniques. A rate constant for reaction of the scavenger with hydroxyl radical can be deduced from the inhibition of chromogen formation. For a wide range of compounds, the results fit well with rate constants previously obtained with other methods. It is suggested that voltammetric deoxyribose assay is a simple and cheap alternative for determination of rate constants for reaction of most biological molecules with hydroxyl radicals. Rate constants for reactions of six kinds of active compounds extracted from rheum, a traditional Chinese herb, have been determined by this method. Reaction mechanism has also been discussed." @default.
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- W1995101383 date "1998-03-01" @default.
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- W1995101383 title "Use of deoxyribose as a probe for the determination of rate constants for reactions of hydroxyl radicals on mercury electrodes" @default.
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- W1995101383 doi "https://doi.org/10.1016/s0302-4598(97)00040-8" @default.
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